Don't falsely marketh as spam. Fixes #1560

git-svn-id: http://svn.automattic.com/wordpress/trunk@3506 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/functions-post.php

@@ -643,6 +643,8 @@ function wp_blacklist_check($author, $email, $url, $comment, $user_ip, $user_age
 	if ( preg_match_all('/&#(\d+);/', $comment . $author . $url, $chars) ) {
 		foreach ($chars[1] as $char) {
 			// If it's an encoded char in the normal ASCII set, reject
+			if ( 38 == $char )
+				continue; // Unless it's &
 			if ($char < 128)
 				return true;
 		}